<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    .box {
      width: 280px;
      height: 100px;
      overflow: hidden;
      border: 1px solid #ccc;
    }
    .scroll-box {
      width: 300px;
      height: 100px;
      overflow-y: scroll;
    }
  </style>
</head>
<body>
<div class="box">
  <div class="scroll-box">
    <ul class="scroll">
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
      <li>章鱼不丸子</li>
    </ul>
  </div>
</div>
</body>
</html>
